NRF SDK , how to disable DMA when using SPI

[cjh39]

Hello,

We are testing with the NRF SDK sample in:

nRF5_SDK_17.0.2_d674dde\examples\peripheral\spi\main.c

How do we disable use_easy_dma. ?

We want to only use the spi without dma.

Also, the spi in the example is set to NRF_DRV_SPI_MODE_0, which is the mode we want, but we actually had to set it to NRF_DRV_SPI_MODE_2 to get the expected settings as NRF_DRV_SPI_MODE_0.

[cjh39]

Hi,

This example runs, using SPI3. This example is set in the config :

spi_config.frequency = NRF_SPIM_FREQ_1M

We've tried to switch it to NRF_SPIM_FREQ_32M, and even toe 16M , but the spi clk is not working at 32M.

Are there additional config flags for the spi and in the sdk_config.h that we need to set ?

[Sigurd]

Hi,

Setting 

spi_config.frequency      = NRF_SPIM_FREQ_32M;

works fine here.

If your logic analyzer has limited sampling rate, then it might give incorrect values. If you are using e.g. Saleae logic, make sure to set it to max sampling rate.